Electricity: motive power systems – Braking – Dynamic braking
Patent
1997-07-22
1998-09-29
Sircus, Brian
Electricity: motive power systems
Braking
Dynamic braking
318 68, 318 77, 318 85, H02P 312, H02P 546
Patent
active
058149562
ABSTRACT:
A method and apparatus for controlling a machine in a power failure. The present invention is applicable to such machines that a tool and a workpiece must always be controlled in synchronization with each other, and allows the tool and workpiece to stop without any damage in the power failure situation. If a power failure occurs during a synchronous cutting operation, the present invention disables a power regeneration function, connects a discharge resistor unit to a DC link of a power regeneration circuit, decelerates motors for tool drive and workpiece drive in synchronization with each other, and retracts the tool back to a safe area by driving a motor for tool feed with the power regenerated from the other two motors.
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Kono Shinichi
Tezuka Junichi
Fanuc Ltd.
Sircus Brian
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